Stock LS2 Cam Overlap
Race Director
Joined: Sep 1999
Posts: 12,437
Likes: 919
From: CONCORD NC
it is the same as the 01 LS6 cam, so look here, halfway down
http://www.idavette.net/hib/02ls6/page2.htm
http://www.idavette.net/hib/02ls6/page2.htm
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
Overlap is calculated...Average duration (intake + exhaust duration divided by 2) minus LSA (lobe separation angle) times two. I'm sure the LS2 cam has major negative overlap. Any cam GM put in a production automobile in the last 20 years has negative overlap. Not knowing the LS2 cam specs, I can't calculate it for you.
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Brett Foote
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,150
From: SW Florida
2021 C6 of the Year Finalist - Modified
Overlap Calculator:
Just enter the cam's intake and exhaust duration and LSA ... it will give you the overlap
http://www.wallaceracing.com/overlap-calc.php
Just enter the cam's intake and exhaust duration and LSA ... it will give you the overlap
http://www.wallaceracing.com/overlap-calc.php
Intermediate
Joined: Jan 2020
Posts: 37
Likes: 7
I honestly don't know of a cam that will pass smog, you're going to have to get in touch with the likes of BTR, TSP, Pat G on this forum and other people/places that know quite a bit about cams. If I had to guess, every factory cam will pass smog including the LS9 cam but the gains/$ really aren't worth it there. You could go with a supercharger setup that will pass smog, but then you're looking at roughly 3-5 thousand dollars more for a much more substantial gain (think 100-200hp vs a cam that'll net 20-30hp in your instance) and never have to worry about passing smog.
Racer
Joined: Jan 2020
Posts: 467
Likes: 47
I'm over here in Germany and I would need to make damn sure this cam would pass emissions. Imagine spending all this money and effort only to hear from the authorities over here that it cannot pass. What cam options do we have for blown motors (positive displacement superchargers) if we want to fulfill SMOG / California emissions regs?
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,150
From: SW Florida
2021 C6 of the Year Finalist - Modified
Leave the stock cam in it ....
Or if you are intent on changing it since you will be supercharged, look for a cam with an LSA around 117 degrees (no less than 117). And if you want the valve springs to last a long time, keep the lift below .600"
Here are the cam specs for the LS9:
Dur: 211°/ 230°
Lift: .562” / .562”
LSA: 122°
ICL: 122°
Overlap: -23.5°
Or if you are intent on changing it since you will be supercharged, look for a cam with an LSA around 117 degrees (no less than 117). And if you want the valve springs to last a long time, keep the lift below .600"
Here are the cam specs for the LS9:
Dur: 211°/ 230°
Lift: .562” / .562”
LSA: 122°
ICL: 122°
Overlap: -23.5°
